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Blue ice on Lake Baikal covered with cracks near the village of Listvyanka, Irkutsk Oblast. Lake Baikal in Siberia is the oldest (25 million years) and deepest (1,700 m) lake in the world. It contains 20% of the world's total unfrozen freshwater reserve, and the surface of its clean waters freeze in winter to give a beautiful turquoise appearance.